The Dryer drive belt broke on my Maytag Model DE312 with serial #15331. I need instructions on threading and installing a new belt. Illustrations would be very helpful

I have a built-in cabinet/shelf unit that is flush against the back wall, and maybe an inch clearance on the sides. There is an enclosed cabinet with front doors that are normally closed in the unit where I want to put a small mini-fridge. I have a few 3" holes thru the back of the cabinet into the wall cavity, and was hoping that would provide enough ventilation for the heat from the fridge. Apparently not enough, since the fridge died after a few months. Does anyone have any suggestions on how to ventilate that enclosed space? Might I need a separate thermostatically controlled fan to circulate air as needed? or would a couple of holes on each side, top and bottom, give me enough ventilation?